Based on comments made by the company behind the product to appleTvHacks.net

Our plugin allows to setup any period of time between 2 slides in the “Slideshow” screensaver mode of AppleTV. The time can be set up in 1 second steps from 1 second to 9999 hours. The standard Apple TV application cripples the slideshow mode and only allows 2,3,5,10 or 20 seconds of time between 2 slides, which is not really usable for displaying digital art. Our ATVDigiframe plugin integrates seamlessly and matches the minimalist style of the AppleTV UI.

NitoTV appliance is a front end for the popular mplayer media player perian and Apple’s DVDPlayback.framework (if installed).

You can create/edit playlists and add files or folders of your choice. By now it should support just about any media format. Create afp, nfs and samba mounts (with bonjour support) Install the kextloader, a variety of kexts/frameworks/binaries, perian, mplayer codecs, play nes, snes, genesis, game gear and gameboy advanced roms, view RSS feeds and 3-day Weather forecast, Launch Applications, and much much more!

Boxee, an open source media center with a focus on UI and social networking is now available on Apple TV!

Boxee will play any non-DRM content, and let users share information with each other and their existing social networks about what they’re watching or listening to. It will also aggregate all your entertainment (video, music, images) into one place and add in any RSS/XML/MMS feed (with mainstream content from sites like Hulu & ABC coming soon).

You can read more about Boxee in this article, or watch the video below.

The installation is very simple, thanks to an installer which formats a USB drive and sets it up to do the installation for you once plugged into your Apple TV.

If you would like to get an invite to the Boxee alpha, simply follow this link http://www.boxee.tv/atvhacks. You can then grab the USB-drive installer software from here.